Manufacture of threads, films, ribbons, etc.



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detected Mar. 25, 1%24.

ALFRED PERL, OF CHEMNITZ, GERMANY.

MANUFACTURE OF THREADS, FILMS, RIBBQHS, ETC.

1E0 Drawing.

To all whom, it may concern:

Be it known that I, ALFRED PERL, a citizen of Czechoslovakia, residingat Chemnitz, Germany, have invented certain new and useful Improvementsin the Manufacture of Threads, Films, Ribbons, Etc. (for which I havetiled application in Germany on November 25, 1920, and likewise anaplication in Czechoslovakia on June 3, 1922) and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to an improved process for the production ofthreads, films, ribbons, etc, from viscose (cellulose Xanthogenate)solutions.

It is known that viscose solutions can be precipitated by introducingthem, e. g., through a suitable extrusion or squirting device, into anacid precipitating bath. As precipitating baths it has been 'KDOSGd touse mineral acid baths or bat )5 containing organic acids. It has alsobeen proposed to add to such baths various mineral salts, as well asorganic substances such as glycol, lactic acid and glucose. The highcost 01: these addition compounds (e. g., glucose and similar organiccompounds), however, and their comparative scarcity, are impediments inthe enriching of the precipitating baths withthese compounds.

It has now been found that exceptionally soft, lustrous and elasticthreads, films, etc, can be obtained by introducing the viscose solutioninto a precipitating bath containin p a high percentage ofcarbohydrates, an that a valuable and particularly advantageous form ofcarbohydrates for use in such baths is the-d-inannose obtained byhydrolysis and saccharification of the shells of the ivory nut or stonenut, or similar fruits, e. g., the corob bean, etc.

In the process of the present invention, the advantageous properties ofsuch carbohydrates are utilized in the acid precipitating baths, intowhich the viscose solution is introduced.

Waste from ivory nut shells is produced in large amounts from buttonmanufacture. When such waste is ground up to a fine powder, and'saecharified. under proper conditions With-mineral or other acids, andthe resulting solution, in which but a small amount of the originalpowdered nut shells Application filed February 7, me. Serial No.681,275.

remains in suspension, is filtered and suitably diluted, and its acidityadjusted if desired, a valuable precipitating bath is obtained whichgives valuable products, such as re ferred to above. a

The hydrolysis or saceharification can be carried out by treating withacid at an elevated temperature, e. g, vith sulfuric acid of 2 to 7592;.Any suitable method of seccharitication can be used which will give asolution rich in the carbohydrates, particu" larly in d-mannose. Thesolution may con tain, e. g., from to 80 per cent oi carbo hydrates,together with the acid remaining from the saccharilication treatment.This acidity may be increased through the addition to the solution of afurther amount of acid, or the acidity may be decreased through additionof alkalies.

The invention-Will be further illustrated by the following example: Y

Fifty parts by weight of ground ivory nut shells, or of ivory nut chips,are sac-. eharilied with twice their Weight of moderately dilutesulfuric acid under suitable couditions, for example, by heating toboiling or under pressure until the saccharifieation has been carried tothe desired degree which requires from to 3 hours, preferably about 1hour. The solution thus obtained is then filtered from solid impuritiesand diluted to such a degree as to leave from 10 to 30?; ofcarbohydrates in the solution, and the acidity is adjusied to correspondwith that desired for the particular viscose to be precipitated. Thisacidity will vary somewhat with the degree of ripeness of the viscosesolution. The resulting solution is used as an acid precipitating bath,and the viscose solution is squirted or extruded therein from suitableextrusion nozzles or devices in the usual way.

The utilization of the novel precipitating bath results in theproduction of exception ally soft, lusirousaud elastic threads, films,etc., i'routhe viscose solution.

I clair...

1. The process of producing threads, lihus. ribbons, etc, from viscosesolutions, which comprises introducing the viscose solution into an acidprecipitating bath containing carlmhydrates produced by thesaccharilication of ivory nut shells or shells of similar fruit.

2. The process according to claim 1 in which ihe precipitating bathcontains from ten to thirty per cent of the carbohydrates 3. The methodof producing a precipitating bath for viscose solutions which comprisessubjecting ivory nut shells o1- shells 5 of similar fruit tosuccharification with an acid, filtering the resulting solution andadjusting the carbohydrate content of the solution to about 10 to 30 percent.

esspm 4. The process of producing threads, films, ribbons, etc, fromviscose solutions, which comprises introducing the viscose solution intoan acid precipitating bath 0011- tuining d-mann0se.

In testimony whereof I aflix my signature.

DR. ALFRED PERL.

